Use an external, dedicated power supply for the evaluation board rather than relying solely on host USB bus power. 3. The Network Rejects the Module After Installation
Apply the modification command sequence required by that specific firmware line: AT+QIREG="IMEI","YOUR_NEW_15_DIGIT_IMEI" Use code with caution. Step 4: Commit Changes and Reboot the Module
Operators often detect changed IMEIs. A network might identify the IMEI as illegitimate and deny network registration. Summary of Key AT Commands Check IMEI AT+GSN or AT+EGMR=0,7 Change IMEI AT+EGMR=1,7," " Restart Modem AT+CFUN=1,1 Check SIM Status AT+CPIN?
AT+CGSN=1
Researchers testing network authentication.
Identity modifications are written to volatile or temporary registers until the module undergoes a hardware cycle. Force an internal reset to flash the changes permanently to the non-volatile memory (NVRAM): AT+CFUN=1,1 Use code with caution.
Which are you using to connect to the module? quectel change imei install
After the procedure, reset the module:
Open a serial terminal program such as , PuTTY , or screen . For Linux, using minicom is common: sudo minicom -b 115200 -D /dev/ttyUSB2 Set the baud rate to 115200, which is standard for Quectel modules.
On specific engineering or un-locked firmware variants, Quectel provides direct AT commands to alter the production IMEI. Query the current IMEI: AT+EGMR=0,7 Use code with caution. Write the new 15-digit identifier: AT+EGMR=1,7,"123456789012345" Use code with caution. Use an external, dedicated power supply for the
Ensure your module receives adequate power (typically 3.3V–4.2V with sufficient amperage), as cellular registrations cause high current spikes. 2. Software Requirements
Quectel is a popular manufacturer of cellular modules, including GSM, UMTS, LTE, and 5G modules. Their modules are widely used in IoT (Internet of Things) applications, such as industrial automation, smart energy management, and transportation.
QFirehose.exe -p COM6 -f change_imei.xml Step 4: Commit Changes and Reboot the Module